Replacing Honeywell ChronoTherm III T8601C with nest thermostat

[Honeywell_sk]

Sorry.  I know it is duplicate. Posting it again as I was not able to reply in my previous post under different profile.

In existing Honeywell ChronoTherm III T8601C  (with wires R, G, B, W, Y ) .  White wire is connected to O terminal ,  Yellow wire is connected to W terminal. Also W and Y and connected using jumpers.  I want to replace this with Nest. Need help with wiring.

Update:   I have Heat pump model  CPE30-1AB Goodman heat pump.  Very Old Model but runs geat...running for 30th year.

pl help with the  wiring.

Nest terminals are as shown in pic

[Patrick_Caezza]

@Honeywell_sk 

Give this a try.

White - O to */OB

Yellow - W to Y (jumper to Y not needed)

Green - G to G

Blue - C to C

Red - R to R

[Honeywell_sk]

I will try it today

[Honeywell_sk]

I connected White wire to terminal O/B on Nest

Yellow wire to terminal Y on Nest

Green wire to Terminal G on nest

Blue wire to Terminal C on nest 

Red wire to Terminal R on nest ....

Set up Nest for cooling ... only heat come up ..indoor temp  started rising

So changed wire configuration  from above to  as here  -- connected White wire o Terminal W on nest    , Connected Blue wire to Terminal C on Nest.  This too caused heat, indor temp started increasing..

Help needed

[Honeywell_sk]

I connected White wire to terminal O/B on Nest

Yellow wire to terminal Y on Nest

Green wire to Terminal G on nest

Blue wire to Terminal C on nest 

Red wire to Terminal R on nest ....

Set up Nest for cooling ... only heat come up ..indoor temp  started rising

So changed wire configuration  from above to  as here  -- connected White wire o Terminal W on nest    , Connected Blue wire to Terminal C on Nest.  This too caused heat, indor temp started increasing..

Help needed

[Honeywell_sk]

@Patrick_Caezza 

connected White wire to terminal O/B on Nest

Yellow wire to terminal Y on Nest

Green wire to Terminal G on nest

Blue wire to Terminal C on nest 

Red wire to Terminal R on nest ....

Set up Nest for cooling ... only heat come up ..indoor temp  started rising

So changed wire configuration  from above to  as here  -- connected White wire o Terminal W on nest    , Connected Blue wire to Terminal C on Nest.  This too caused heat, indor temp started increasing..

Help needed

[Markjosephp]

Hello there,

I wanted to stop by and see how I could help.

Thanks for looking into this, @Patrick_Caezza.

@Honeywell_sk, I see no wire connected specifically to the Y terminal from your old thermostat, only a jumper wire. With this, I'd suggest resetting your Nest Thermostat to its default setting and continuing the setup process. Please make sure to select the same configuration suggested above.

Once the setup is complete, activate your system and let us know how it goes.

Regards,
Mark

[Honeywell_sk · Accepted solution]

@Patrick_Caezza 

Connected Y G R W ,         Blue wire to O/B

then went to Device settings Configuration in Home App  ---> thermostat > Heatpump->  Highlighted Heat pump wire to O.

This worked. 

[Shan_K]

@Patrick_Caezza   Sorry.  There was a typo in my previous answer, which has worked.  Below is correct wiring which worked 

then went to Device settings Configuration in Home App  ---> thermostat > Heatpump->  Highlighted Heat pump wire to O.

This has worked. Can you think of any issue in this wiring?

[Jenelyn_O]

Hi everyone,

I'm sorry for the delay. I know it's been a while already. Thanks for checking it with us — I'm glad that it's working. It looks like all the wires are connected to its correct terminal. Please monitor your Nest thermostat performance and efficiency. If anything comes up, let us know. 

I appreciate your help, @Patrick_Caezza and Mark.

Best,

Jenelyn

[Shan_K]

In existing Honeywell ChronoTherm III T8601C  (with wires R, G, B, W, Y ) .  White wire is connected to O terminal ,  Yellow wire is connected to W terminal. Also W and Y and connected using jumpers.  I want to replace this with Nest. Need help with wiring.

Update:   I have Heat pump model  CPE30-1AB Goodman heat pump.  Very Old Model but runs gr8...running for 30th year.

Nest terminals are as shown in pic

Nest thermostat terminals

[Shan_K]

I was not able to start conversation  as reply button was disabled.   So I am Updating  my original post by replying  to my post:  I have Heat pump model  CPE30-1AB Goodman heat pump.  Very Old Model but runs gr8...running for 30th year.

Nest terminals are as shown in pic

[Patrick_Caezza]

@Shan_K 

 See your other post for an answer.

https://www.googlenestcommunity.com/t5/Nest-Thermostats/Replacing-Honeywell-ChronoTherm-III-T8601C-w... 

[Markjosephp]

Hi everyone,

Your thread is now identical to this primary post. The main thread will be where you'll find all the updates on this matter, so we advise checking and updating it as needed.

Best,

Mark

[Shan_K]

thanks @Markjosephp